Puberty and adolescence are not generally times of great stress and tu
rmoil. The storm-and-stress theory has a long history, but can no long
er be supported by recent empirical research. A modern approach to the
psychosocial changes of these phases is based on the concept of devel
opmental tasks in an age-appropriate and. stage-appropriate way. Biolo
gical processes can influence an individual's psychological and psycho
social state, but psychological and psychosocial events may also influ
ence the biological systems. Therefore, the timing and outcome of pube
rtal processes can be modified by psychosocial factors. The most impor
tant psychological and psychosocial changes in puberty and early adole
scence are the emergence of abstract thinking, the growing ability of
absorbing the perspectives of viewpoints of others, an increased abili
ty of introspection, the development of personal and sexual identity,
the establishment of a system of values, increasing autonomy from fami
ly and more personal independence, greater importance of peer relation
ships of sometimes subcultural quality, and the emergence of skills ac
id coping strategies to overcome problems and crises. Ah these changes
can be looked on as developmental tasks during normal development, bu
t they can also help in understanding developmental deviations and psy
chopathological disorders. From the viewpoint of developmental psychop
athology, several psychiatric disorders of puberty and adolescence can
be seen in a new light.